Darlington power transistor

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Darlington Power Transistor (NPN)

This little guy is great for powering devices with an IC. it's basically two transistors in the same package; one connects to the low-powered output from the PIC, and drives the other one enthusiastically. The net effect is that you can use the tiny current available from a PIC output pin to efficiently switch currents of several amps.

More info in Wikipedia...